Chemistry lab

Lab 5 Electron Configuration CHEM101L

Student Name: Elfreda Geebah Access Code (located on the lid of your lab kit):

Pre-Lab Questions

1. What is electron configuration?

2. How is the light emitted by an atom related to its electron configuration?

Data

Table 1: Results of firework material ignition

Substance	Observations
Lithium Chloride	Orange
Sodium Chloride	Dark Orange flame
Potassium Chloride	Dark Orange flame
Calcium Chloride	Flame

Post-Lab Questions

1. Write out the electron configurations for each of the following elements. Potassium is already done as an example for you. HINT: The periodic table is very helpful and can be used as a guide.

Element	Electron Configuration
K	1s22s22p63s23p64s1
Li	1S22S1
Na	1S22S22P63S1
Ca	1S22S22P63S23P64S2

2. What is the approximate wavelength of light emitted by each of the salts?

Salt	Color	Wavelength
LiCl	Dark red	600-665
NaCl	Light orange	610-630
KCl	Lilac	400
CaCl2	Orange	630

3. Why does a salt compound give off light or a colored flame when burned?

4. Did sodium chloride and potassium chloride give off similar colors? Why or why not?

Yes. Due to the same color they have therefore they make up of the same wavelength range.

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